An energy and application scenario aware active RFID protocol

Authors:
Björn Nilsson;Lars Bengtsson;Bertil Svensson
Affiliations:
1Centre for Research on Embedded Systems, Halmstad University, Halmstad, Sweden and 2Research Department, Free2move AB, Halmstad, Sweden;1Centre for Research on Embedded Systems, Halmstad University, Halmstad, Sweden and 3Department of Computer Science and Engineering, Chalmers University of Technology, Gothenburg, Sweden;1Centre for Research on Embedded Systems, Halmstad University, Halmstad, Sweden
Venue:
EURASIP Journal on Wireless Communications and Networking
Year:
2010

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Abstract

The communication protocol used is a key issue in order to make the most of the advantages of active RFID technologies. In this paper we introduce a carrier sense medium access data communication protocol that dynamically adjusts its back-off algorithm to best suit the actual application at hand. Based on a simulation study of the effect on tag energy cost, read-out delay, and message throughput incurred by some typical back-off algorithms in a CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) active RFID protocol, we conclude that by dynamic tuning of the initial contention window size and back-off interval coefficient, tag energy consumption and read-out delay can be significantly lowered. We show that it is possible to decrease the energy consumption per tag payload delivery with more than 10 times, resulting in a 50% increase in tag battery lifetime. We also discuss the advantage of being able to predict the number of tags present at the RFID-reader as well as ways of doing it.